// as the source of traffic, such as from the ingress gateway. For example:
//
//	RunFromClusters(func(t framework.TestContext, src cluster.Cluster, dst echo.Instances)) {
//	  ingr := ist.IngressFor(src)
//	  ingr.CallWithRetryOrFail(...)
//	})
func (t *T) RunFromClusters(testFn oneClusterOneTest) {
	t.toEachDeployment(t.rootCtx, func(ctx framework.TestContext, dstInstances echo.Instances) {
		t.setupPair(ctx, nil, echo.Services{dstInstances})